More Airbnb Problems

Is there any recourse against Airbnb when they don't refund your money as promised, or when they don't refund in accordance with their policies? I've had two situations in the past year where Airbnb Support passes me from person to person and then never refunds my money.

Short of opening a dispute with the bank, is there any process to have a well-trained person take a look at a reservation? Or is the only solution to let them steal my money and stop using the platform...